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• Apache2 Modpython : IOError: Write failed, client closed connection.

  - by llazzaro

  This is the error : [Mon Mar 01 12:19:50 2010] [error] [client XXX.XXX.248.60] mod_python (pid=9528, interpreter='realpage.com', phase='PythonHandler', handler='django.core.handlers.modpython'): Application error [Mon Mar 01 12:19:50 2010] [error] [client XXX.XXX.248.60] ServerName: 'realpage.dom' [Mon Mar 01 12:19:50 2010] [error] [client XXX.XXX.248.60] DocumentRoot: '/htdocs' [Mon Mar 01 12:19:50 2010] [error] [client XXX.XXX.248.60] URI: '/' [Mon Mar 01 12:19:50 2010] [error] [client XXX.XXX.248.60] Location: '/' [Mon Mar 01 12:19:50 2010] [error] [client XXX.XX.248.60] Directory: None [Mon Mar 01 12:19:50 2010] [error] [client XXX.XXX.248.60] Filename: '/htdocs' [Mon Mar 01 12:19:50 2010] [error] [client XXX.XXX.248.60] PathInfo: '/' [Mon Mar 01 12:19:50 2010] [error] [client XXX.XXX.248.60] Traceback (most recent call last): [Mon Mar 01 12:19:50 2010] [error] [client XXX.XXX.248.60] File "/usr/lib/python2.5/site-packages/mod_python/importer.py", line 1537, in HandlerDispatch\n default=default_handler, arg=req, silent=hlist.silent) [Mon Mar 01 12:19:50 2010] [error] [client XXX.XXX.248.60] File "/usr/lib/python2.5/site-packages/mod_python/importer.py", line 1229, in _process_target\n result = _execute_target(config, req, object, arg) [Mon Mar 01 12:19:50 2010] [error] [client XXX.XXX.248.60] File "/usr/lib/python2.5/site-packages/mod_python/importer.py", line 1128, in _execute_target\n result = object(arg) [Mon Mar 01 12:19:50 2010] [error] [client XXX.XXX.248.60] File "/usr/lib/python2.5/site-packages/django/core/handlers/modpython.py", line 228, in handler\n return ModPythonHandler()(req) [Mon Mar 01 12:19:50 2010] [error] [client XXX.XXX.248.60] File "/usr/lib/python2.5/site-packages/django/core/handlers/modpython.py", line 220, in call\n req.write(chunk) [Mon Mar 01 12:19:50 2010] [error] [client XXX.XX.248.60] IOError: Write failed, client closed connection. Please! I am sure you need more information in order to find the bug, please tell me what and how to get it. The error is throwing every time!

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• nginx not serving admin static files?

  - by toto_tico

  First, I want to clarify that this error is just for the admin static files. This means my problem is specific just to the static files that corresponds to the Django admin. The rest of the static files are working perfect. Basically my problem is that for some reason I cannot access those admin static files with the ngix server. It works perfect with the micro server of Django and the collect static is doing its job. This means it is putting the files on the expected place in the static folder. The urls are correct but I cannot even access the admin static files directly, but the others I can. So, for example, I am able to access this url (copying it in the browser): myserver.com:8080/static/css/base/base.css but i am not able to access this other url (copying it in the browser): myserver.com:8080/static/admin/css/admin.css I also tried to copy the admin/ directory structure into other_admin_directory_name/. Then I can access myserver.com:8080/static/other_admin_directory_name/css/admin.css Then, it works. So, I checked permissions and everything is fine. I tried to change ADMIN_MEDIA_PREFIX = '/static/admin/' to ADMIN_MEDIA_PREFIX = '/static/other_admin_directory_name/', it doesn't work. This a mistery in itself that I am exploring but still no luck. Finally, and it seems to be an important clue: I tried to copy the admin/ directory structure into admin_and_then_any_suffix/. Then I cannot access myserver.com:8080/static/admin_and_then_any_suffix//css/admin.css So, if the name of the directory starts with admin (for example administration or admin2) it doesn't work. * added thanks to sarnold observation ** the problem seems to be in the nginx configuration file /etc/nginx/sites-available/mysite location /static/admin { alias /home/vl3/.virtualenvs/vl3/lib/python2.7/site-packages/django/contrib/admin/media/; }

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• Celery daemon as a Ubuntu service does not consume tasks while running from terminal does

  - by Guy

  On Ubuntu 11.10, I have to issue python tasks from django using celery. I'm currently testing on the same machine but eventually the celery worker should run on a remote machine. django uses the following settings: BROKER_HOST = "127.0.0.1" BROKER_PORT = 5672 BROKER_VHOST = "/my_vhost" BROKER_USER = "celery" BROKER_PASSWORD = "celery" I can also see my task queued in http://localhost:55672/#/queues the celery daemon uses the following configuration (celeryconfig.py): BROKER_HOST = "127.0.0.1" BROKER_PORT = 5672 BROKER_USER = "celery" BROKER_PASSWORD = "celery" BROKER_VHOST = "/my_vhost" CELERY_RESULT_BACKEND = "amqp" import os import sys sys.path.append(os.getcwd()) CELERY_IMPORTS = ("tasks", ) running celeryd -l info works well and now I want to run it as a service. I've followed the instructions from http://ask.github.com/celery/cookbook/daemonizing.html and now I'm trying to run it using: sudo /etc/init.d/celeryd start But the message is not being consumed, no error in the celery log either. /etc/default/celeryd CELERYD_NODES="w1" CELERYD_CHDIR="/path/to/django/project" CELERYD_OPTS="--time-limit=300 --concurrency=1" CELERY_CONFIG_MODULE="celeryconfig" # %n will be replaced with the nodename. CELERYD_LOG_FILE="/var/log/celery/%n.log" CELERYD_PID_FILE="/var/run/celery/%n.pid" # Workers should run as an unprivileged user. CELERYD_USER="celery" CELERYD_GROUP="celery" I've also created user celery in Ubuntu not sure if its necessary. Any help will be appreciated, Thanks, Guy

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• MySQL Not Turning On

  - by Shalin Shah

  I have an amazon ec2 instance running on the Amazon Linux AMI and its a micro instance. I wanted to install Django onto my server so I entered these commands wget http://www.mlsite.net/blog/wp-content/uploads/2008/11/go wget http://www.mlsite.net/blog/wp-content/uploads/2008/11/django.conf chmod 744 go ./go So after I was done, I ran sudo service httpd restart and sudo service mysqld restart and This is what came up for mysqld: Stopping mysqld: [ OK ] MySQL Daemon failed to start. Starting mysqld: [FAILED] So I deleted the django files /usr/local/python2.6.8/site-packages/django_registration.egg and I tried finding the error and I found out that in my /etc/my.cnf for the socket, it said socket=/var/lock/subsys/mysql.sock so I went to /var/lock/subsys/ and there was no mysql.sock. I tried creating one using vim but it still didn't work. Then I checked the error log and it said Can't connect to local MySQL server through socket '/var/run/mysqld/mysqld.sock' (2) So I am pretty much lost right now. I know it has something to do with mysql.sock If you might know a reason why this was caused could you please let me know? I have a wordpress site on my server, so i kind of need MySQL to work. Thanks!

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• JUnit for Functions with Void Return Values

  - by RobotNerd

  I've been working on a Java application where I have to use JUnit for testing. I am learning it as I go. So far I find it to be useful, especially when used in conjunction with the Eclipse JUnit plugin. After playing around a bit, I developed a consistent method for building my unit tests for functions with no return values. I wanted to share it here and ask others to comment. Do you have any suggested improvements or alternative ways to accomplish the same goal? Common Return Values First, there's an enumeration which is used to store values representing test outcomes. public enum UnitTestReturnValues { noException, unexpectedException // etc... } Generalized Test Let's say a unit test is being written for: public class SomeClass { public void targetFunction (int x, int y) { // ... } } The JUnit test class would be created: import junit.framework.TestCase; public class TestSomeClass extends TestCase { // ... } Within this class, I create a function which is used for every call to the target function being tested. It catches all exceptions and returns a message based on the outcome. For example: public class TestSomeClass extends TestCase { private UnitTestReturnValues callTargetFunction (int x, int y) { UnitTestReturnValues outcome = UnitTestReturnValues.noException; SomeClass testObj = new SomeClass (); try { testObj.targetFunction (x, y); } catch (Exception e) { UnitTestReturnValues.unexpectedException; } return outcome; } } JUnit Tests Functions called by JUnit begin with a lowercase "test" in the function name, and they fail at the first failed assertion. To run multiple tests on the targetFunction above, it would be written as: public class TestSomeClass extends TestCase { public void testTargetFunctionNegatives () { assertEquals ( callTargetFunction (-1, -1), UnitTestReturnValues.noException); } public void testTargetFunctionZeros () { assertEquals ( callTargetFunction (0, 0), UnitTestReturnValues.noException); } // and so on... } Please let me know if you have any suggestions or improvements. Keep in mind that I am in the process of learning how to use JUnit, so I'm sure there are existing tools available that might make this process easier. Thanks!

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• Is throwing an exception a healthy way to exit?

  - by ramaseshan

  I have a setup that looks like this. class Checker { // member data Results m_results; // see below public: bool Check(); private: bool Check1(); bool Check2(); // .. so on }; Checker is a class that performs lengthy check computations for engineering analysis. Each type of check has a resultant double that the checker stores. (see below) bool Checker::Check() { // initilisations etc. Check1(); Check2(); // ... so on } A typical Check function would look like this: bool Checker::Check1() { double result; // lots of code m_results.SetCheck1Result(result); } And the results class looks something like this: class Results { double m_check1Result; double m_check2Result; // ... public: void SetCheck1Result(double d); double GetOverallResult() { return max(m_check1Result, m_check2Result, ...); } }; Note: all code is oversimplified. The Checker and Result classes were initially written to perform all checks and return an overall double result. There is now a new requirement where I only need to know if any of the results exceeds 1. If it does, subsequent checks need not be carried out(it's an optimisation). To achieve this, I could either: Modify every CheckN function to keep check for result and return. The parent Check function would keep checking m_results. OR In the Results::SetCheckNResults(), throw an exception if the value exceeds 1 and catch it at the end of Checker::Check(). The first is tedious, error prone and sub-optimal because every CheckN function further branches out into sub-checks etc. The second is non-intrusive and quick. One disadvantage is I can think of is that the Checker code may not necessarily be exception-safe(although there is no other exception being thrown anywhere else). Is there anything else that's obvious that I'm overlooking? What about the cost of throwing exceptions and stack unwinding? Is there a better 3rd option?

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• How do I 'globally' catch exceptions thrown in object instances.

  - by SleepyBobos

  I am currently writing a winforms application (C#). I am making use of the Enterprise Library Exception Handling Block, following a fairly standard approach from what I can see. IE : In the Main method of Program.cs I have wired up event handler to Application.ThreadException event etc. This approach works well and handles the applications exceptional circumstances. In one of my business objects I throw various exceptions in the Set accessor of one of the objects properties set { if (value > MaximumTrim) throw new CustomExceptions.InvalidTrimValue("The value of the minimum trim..."); if (!availableSubMasterWidthSatisfiesAllPatterns(value)) throw new CustomExceptions.InvalidTrimValue("Another message..."); _minimumTrim = value; } My logic for this approach (without turning this into a 'when to throw exceptions' discussion) is simply that the business objects are responsible for checking business rule constraints and throwing an exception that can bubble up and be caught as required. It should be noted that in the UI of my application I do explictly check the values that the public property is being set to (and take action there displaying friendly dialog etc) but with throwing the exception I am also covering the situation where my business object may not be used by a UI eg : the Property is being set by another business object for example. Anyway I think you all get the idea. My issue is that these exceptions are not being caught by the handler wired up to Application.ThreadException and I don't understand why. From other reading I have done the Application.ThreadException event and it handler "... catches any exception that occurs on the main GUI thread". Are the exceptions being raised in my business object not in this thread? I have not created any new threads. I can get the approach to work if I update the code as follows, explicity calling the event handler that is wired to Application.ThreadException. This is the approach outlined in Enterprise Library samples. However this approach requires me to wrap any exceptions thrown in a try catch, something I was trying to avoid by using a 'global' handler to start with. try { if (value > MaximumTrim) throw new CustomExceptions.InvalidTrimValue("The value of the minimum..."); if (!availableSubMasterWidthSatisfiesAllPatterns(value)) throw new CustomExceptions.InvalidTrimValue("Another message"); _minimumTrim = value; } catch (Exception ex) { Program.ThreadExceptionHandler.ProcessUnhandledException(ex); } I have also investigated using wiring a handler up to AppDomain.UnhandledException event but this does not catch the exceptions either. I would be good if someone could explain to me why my exceptions are not being caught by my global exception handler in the first code sample. Is there another approach I am missing or am I stuck with wrapping code in try catch, shown above, as required?

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• how do i write an init script for django-supervisor

  - by amateur

  pardon me as this is my first time attempting to write a init script for centos 5. I am using django + supervisor to manage my celery workers, scheduler. Now, this is my naive simple attempt /etc/init.d/supervisor #!/bin/sh # # /etc/rc.d/init.d/supervisord # # Supervisor is a client/server system that # allows its users to monitor and control a # number of processes on UNIX-like operating # systems. # # chkconfig: - 64 36 # description: Supervisor Server # processname: supervisord # Source init functions /home/foo/virtualenv/property_env/bin/python /home/foo/bar/manage.py supervisor --daemonize inside my supervisor.conf: [program:celerybeat] command=/home/property/virtualenv/property_env/bin/python manage.py celerybeat --loglevel=INFO --logfile=/home/property/property_buyer/logfiles/celerybeat.log [program:celeryd] command=/home/foo/virtualenv/property_env/bin/python manage.py celeryd --loglevel=DEBUG --logfile=/home/foo/bar/logfiles/celeryd.log --concurrency=1 -E [program:celerycam] command=/home/foo/virtualenv/property_env/bin/python manage.py celerycam I couldn't get it to work. 2013-08-06 00:21:03,108 INFO exited: celerybeat (exit status 2; not expected) 2013-08-06 00:21:06,114 INFO spawned: 'celeryd' with pid 11772 2013-08-06 00:21:06,116 INFO spawned: 'celerycam' with pid 11773 2013-08-06 00:21:06,119 INFO spawned: 'celerybeat' with pid 11774 2013-08-06 00:21:06,146 INFO exited: celerycam (exit status 2; not expected) 2013-08-06 00:21:06,147 INFO gave up: celerycam entered FATAL state, too many start retries too quickly 2013-08-06 00:21:06,147 INFO exited: celeryd (exit status 2; not expected) 2013-08-06 00:21:06,152 INFO gave up: celeryd entered FATAL state, too many start retries too quickly 2013-08-06 00:21:06,152 INFO exited: celerybeat (exit status 2; not expected) 2013-08-06 00:21:07,153 INFO gave up: celerybeat entered FATAL state, too many start retries too quickly I believe it is the init script, but please help me understand what is wrong.

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• Server performance worsened after a hardware upgrade: how should I reconfigure the server?

  - by twick

  I'm running a site on an Ubuntu/Apache/Django/PostgreSQL stack. We upgraded our server recently from 1 processor with 2 Gb total RAM (with 0.5 Gb of that RAM assigned to memcached) to a new server that has 2 processors with 4 Gb total RAM (with 2 Gb of that RAM assigned to memcached). However, when I looked at Google Webmaster Tools, I found out that the average page speed has worsened from 5 seconds to 15 seconds. Why would performance get worse with a hardware upgrade? What should I check and tune? Is this more likely to be a problem with memcached, Apache, Django, or PostgreSQL?

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• Installing GeoIP on Mac?

  - by Richard

  I want to install the MaxMind GeoIP C library, so that I can use GeoIP as part of Django. I'm working on MacOS. I've downloaded GeoIP-1.4.8.tar.gz from here and run: ./configure make make check make install without any problems. I've also downloaded GeoIP.dat.gz and GeoLiteCity.dat.gz, unzipped them and put them in a local directory. Then I've set the following paths in my settings.py: GEOIP_PATH = 'path_to_dat_files' GEOIP_LIBRARY_PATH = 'path_to_c_files' Now I'm trying to run python manage.py migrate (which has a reference to GeoIP in a project I'm using), but I'm still getting this error: from django.contrib.gis.utils import GeoIP ImportError: cannot import name GeoIP Any ideas? Thanks.

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• Why would the 'show processlist' command speed up normally slow requests to my remote DB? (connected via VPN)

  - by Hakan B.

  I am running a local Django development server that connects to a remote MySQL server via a VPN (IPSec). Request times are awfully slow and I consistently see timeouts. Attempting to diagnose the problem, I logged in to the remote database and ran: show full processlist Immediately, the local server went from idle to working. The page had not yet completely loaded, but progress had been made (debug logs confirm this). When I ran 'show full processlist' several times more in succession, the request completed quickly. I can currently reproduce this - unless I run 'show full processlist' over and over on the remote server, my local request usually times out. Does anyone have any idea why this would happen? I'm running Django 1.3 and OS X 10.7. Note: I realize this may be entirely not be a question with a clear-cut answer and is probably my fault, but it is odd and reproducable, so I hope someone can at least point me the right direction. Thanks in advance.

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• Amazon EC2: Not able to open web application even if port it opened

  - by learner

  I have a t1.micro instance with public dns looks similar to ec2-184-72-67-202.compute-1.amazonaws.com (some numbers changed) On this machine, I am running a django app $ sudo python manage.py runserver --settings=vlists.settings.dev Validating models... 0 errors found Django version 1.4.1, using settings 'vlists.settings.dev' Development server is running at http://127.0.0.1:8000/ I have opened the port 8000 through AWS console Now when I hit the following in Chrome http://ec2-184-72-67-202.compute-1.amazonaws.com:8000, I get Oops! Google Chrome could not connect to WHat is that I am doing wrong?

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• One of my apache processes is huge - how can I find out why?

  - by Malcolm Box

  I'm running Apache 2.2.12 with mod_wsgi, hosting a Django site. Most of the apache child processes weigh in at about 125MB RSS, but occasionally I see one child balloon to 1GB RSS. At this point there's usually 1 huge process (1GB), a couple of large ones (500MB) and the rest are still ~125MB. These are the mod_wsgi daemon processes. I've tried using memory leak tracing in Python to see if it's the Django code, and I see no leaks. Looking in the logs doesn't show any particularly strange requests. I'm stumped on how to figure out what's causing this - any ideas? Also, any workaround ways to kill the large apache process when it gets too big, without bringing apache down? Some more details: Not using mod_php Using pre-fork

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• Is there any way to isolate the python2.7 , mod_wsgi installation from main environment

  - by user31

  I have many local virtual machines for building the django websites. I find it very hard to configure all the machines with mod_wsgi , python and all that installation issues. Is there any way that i can install even python 2.7 , mod_wsgi etc and all that inside the virtual environment folder so that i can just copy paste that folder in my live server and i don't need to mess with mos_wsgi , python 2.7 and other issues. Is it possible or even any close variation of that so that puting the site to live servers is very easy and everything which is needed by site should be included locally I also face many problems when i need to move the django sites across servers

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• Sometimes my urls get masked with the IP address instead of the domain

  - by user64631

  I have a server with one A record that points to my IP address. I have nginx with gunicorn as a prefork which goes to my django application For most of my pages, the URL is always my domain name in the url bar. However if I go to mydomain.com/admin the url magically transforms into x.x.x.x/admin in the url bar of my browser. I thought that was weird but I ignored it figuring it only happened for admin so it wasnt that big of a deal. Then I installed django-registration. So when I go to mydomain.com/accounts/register the url is still mydomain.com/accounts/register in the url bar. but when I submit a form, the POST request goes to x.x.x.x/accounts/register which creates a cross domain error. So I decided that it wasnt isolated to the admin and I really need to fix what is going on. I have no idea what is going on and am completely lost.

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• PyDev and Django: how to restart dev server?

  - by Rosarch

  I'm new to Django. I think I'm making a simple mistake. I launched the dev server with Pydev: RClick on project Django Custom command runserver The server came up, and everything was great. But now I'm trying to stop it, and can't figure out how. I stopped the process in the PyDev console, and closed Eclipse, but web pages are still being served from http://127.0.0.1:8000. I launched and quit the server from the command line normally: python manage.py runserver But the server is still up. What am I doing wrong here?

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• Simple mail server setup for a user-based website.

  - by Absolute0

  I am working on a simple website that has user registration. All I need to do is confirm email addresses by emailing a confirmation email and maybe send out periodic emails regarding various information. I am also considering having a [email protected] email for user questions and comments. The application is written in django and I am running it on ArchLinux on a VPS. I have no knowledge of mail servers. I tried setting up postfix and qmail but had no luck. They are complicated and require a lot of configuration to get them working properly. My use case is super simple and doesn't not require anything fancy. Is there any simple mailing setup that will enable me to quickly get emailing working with my django app with minimal work?

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• What exactly is an invalid HTTP_HOST header

  - by rolling stone

  I've implemented Django's relatively new allowed hosts setting, which is meant to prevent attackers from submitting requests with a fake HTTP Host header. Since adding that setting, I now get anywhere from 20-100 emails a day notifying me of invalid HTTP_HOST headers. I've copied in an example of a typical error message below. I'm hosting my site on EC2, and am relatively new to setting up/maintaining a server, so my question is what exactly is happening here, and what is the best way to manage these invalid and I assume malicious requests? [Django] ERROR: Invalid HTTP_HOST header: 'www.launchastartup.com'.You may need to add u'www.launchastartup.com' to ALLOWED_HOSTS.

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• Send nginx X-Accel-Redirect request from remote server

  - by phingage

  I have 2 server first (domain.com) is a django/apache server, second (f1.domain.com) is a file server (nginx) where some files are protected and should be allow download only to registred user, so i have setup a nginx server with a server { listen 80 default_server; server_name *.domanin.com; access_log /home/domanin/logs/access.log; location /files/ { internal; root /home/domanin; } } and from django I send a request via X-Accel-Redirect header, but dosen't work i think because come from a remote server, how can i accomplish my task? regards!

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• Use multiple WSGI mount points in Apache with an Nginx reverse proxy

  - by Thomas

  I am trying to set up multiple virtual hosts on the same server with Nginx and Apache and have run into a curious configuration issue. I have nginx is configured with a generic upstream to apache. upstream backend { server 1.1.1.1:8080; } I'm trying to set up multiple subdomains in nginx that hit different mountpoints in apache. Each would act like the following examples. server { listen 80; server_name foo.yoursite.com; location / { proxy_pass http://backend/bar/; include /etc/nginx/proxy.conf; } ... } server { listen 80; server_name delta.yoursite.com; location / { proxy_pass http://backend/gamma/; include /etc/nginx/proxy.conf; } ... } These mountpoints are pointed at django projects, however each of the url entries are coming back prepended with the apache mountpoint path. So, if I called the django url entry for foo.yoursite.com/wiki/biz/, django appears to be returning foo.yoursite.com/bar/wiki/biz/. Similarly, if I call for the url entry for delta.yoursite.com/wiki/biz/, I get delta.yoursite.com/gamma/wiki/biz/. Is there any way get rid of the prefix being returned on the url entries by django and apache?

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• python-social-auth AuthCanceled exception

  - by vero4ka

  I'm using python-social-auth in my Django application for authentication via Facebook. But when a user tries to login and when it's been refirected to Facebook app page clicks on "Cancel" button, appears the following exception: ERROR 2014-01-03 15:32:15,308 base :: Internal Server Error: /complete/facebook/ Traceback (most recent call last): File "/home/vera/virtualenv/myapp/local/lib/python2.7/site-packages/django/core/handlers/base.py", line 114, in get_response response = wrapped_callback(request, *callback_args, **callback_kwargs) File "/home/vera/virtualenv/myapp/local/lib/python2.7/site-packages/django/views/decorators/csrf.py", line 57, in wrapped_view return view_func(*args, **kwargs) File "/home/vera/virtualenv/myapp/local/lib/python2.7/site-packages/social/apps/django_app/utils.py", line 45, in wrapper return func(request, backend, *args, **kwargs) File "/home/vera/virtualenv/myapp/local/lib/python2.7/site-packages/social/apps/django_app/views.py", line 21, in complete redirect_name=REDIRECT_FIELD_NAME, *args, **kwargs) File "/home/vera/virtualenv/myapp/local/lib/python2.7/site-packages/social/actions.py", line 54, in do_complete *args, **kwargs) File "/home/vera/virtualenv/myapp/local/lib/python2.7/site-packages/social/strategies/base.py", line 62, in complete return self.backend.auth_complete(*args, **kwargs) File "/home/vera/virtualenv/myapp/local/lib/python2.7/site-packages/social/backends/facebook.py", line 63, in auth_complete self.process_error(self.data) File "/home/vera/virtualenv/myapp/local/lib/python2.7/site-packages/social/backends/facebook.py", line 56, in process_error super(FacebookOAuth2, self).process_error(data) File "/home/vera/virtualenv/myapp/local/lib/python2.7/site-packages/social/backends/oauth.py", line 312, in process_error raise AuthCanceled(self, data.get('error_description', '')) AuthCanceled: Authentication process canceled Is the any way to catch it Django?

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• How to localize an app on Google App Engine?

  - by Petri Pennanen

  What options are there for localizing an app on Google App Engine? How do you do it using Webapp, Django, web2py or [insert framework here]. 1. Readable URLs and entity key names Readable URLs are good for usability and search engine optimization (Stack Overflow is a good example on how to do it). On Google App Engine, key based queries are recommended for performance reasons. It follows that it is good practice to use the entity key name in the URL, so that the entity can be fetched from the datastore as quickly as possible. Currently I use the function below to create key names: import re import unicodedata def urlify(unicode_string): """Translates latin1 unicode strings to url friendly ASCII. Converts accented latin1 characters to their non-accented ASCII counterparts, converts to lowercase, converts spaces to hyphens and removes all characters that are not alphanumeric ASCII. Arguments unicode_string: Unicode encoded string. Returns String consisting of alphanumeric (ASCII) characters and hyphens. """ str = unicodedata.normalize('NFKD', unicode_string).encode('ASCII', 'ignore') str = re.sub('[^\w\s-]', '', str).strip().lower() return re.sub('[-\s]+', '-', str) This works fine for English and Swedish, however it will fail for non-western scripts and remove letters from some western ones (like Norwegian and Danish with their œ and ø). Can anyone suggest a method that works with more languages? 2. Translating templates Does Django internationalization and localization work on Google App Engine? Are there any extra steps that must be performed? Is it possible to use Django i18n and l10n for Django templates while using Webapp? The Jinja2 template language provides integration with Babel. How well does this work, in your experience? What options are avilable for your chosen template language? 3. Translated datastore content When serving content from (or storing it to) the datastore: Is there a better way than getting the *accept_language* parameter from the HTTP request and matching this with a language property that you have set with each entity?

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• general learning methodology

  - by momo

  just wanted to hear on the different general learning paths people embark on when learning a new language/framework. the one i currently use, which is how i learned bash and am currently learning python, is: instant hacking tutorial (very short tutorial introducing the basic syntax, variable declaration, loops, data types, etc. and how they are generally used) in depth tutorial with good programming style and slightly topic-specific (e.g. Mark Pilgrim's Dive into Python), important topics for me personally are regex methods, file IO, and ways the different data types are utilized best (i wrote a very primitive bayesian spam filter using python's dictionaries to keep track of word occurrences) spaced-repition of syntax or short recipes (i use anki, with questions like 'create dictionary with filename and filesize metadata, human-readable' or simpler ones like 'match 0 - 3 occurences of the letter M in a string', or 'return/create an iterator from two sequences') the use of spaced-repitition has been invaluable, and i credit it with the ease that i can recall/create python algorithms. however, i've recently started looking into django, and i've found that spaced-repitition, at least in my case, doesn't work very well for learning a framework, it works best with short code recipes (either that or i should start looking into more basic django framework tutorials). the problem i'm encountering is that since framework programming is not only algorithms, but actually learning the API, which can be quite complex since you have to learn all the methods, modules, the places where they are stored, and the sequence of which things have to be done. for ex. in django to start a project that deals with polls (from the django tutorial), one has to create the project, edit the settings.py file, create the polls app, edit the models.py file (which requires knowing the classes that are present in the module models), edit the urls.py file, etc. i found that my spaced-repition method didn't work very well for this type of learning, so i wanted to ask you guys what method(s) you use for learning the different frameworks/APIs.

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• How can i use a commandlinetool (ie. sox) via subprocess.Popen with mod_wsgi?

  - by marue

  I have a custom django filefield that makes use of sox, a commandline audiotool. This works pretty well as long as i use the django development server. But as soon as i switch to the production server, using apache2 and mod_wsgi, mod_wsgi catches every output to stdout. This makes it impossible to use the commandline tool to evaluate the file, for example use it to check if the uploaded file really is an audio file like this: filetype=subprocess.Popen([sox,'--i','-t','%s'%self.path], shell=False,\ stdout=subprocess.PIPE, stderr=subprocess.PIPE) (filetype,error)=filetype.communicate() if error: raise EnvironmentError((1,'AudioFile error while determining audioformat: %s'%error)) Is there a way to workaround for this? edit the error i get is "missing filename". I am using mod_wsgi 2.5, standard with ubuntu 8.04. edit2 What exactly happens, when i call subprocess.Popen from within django in mod_wsgi? Shouldn't subprocess stdin/stdout be independent from django stdin/stdout? In that case mod_wsgi should not affect programms called via subprocess... I'm really confused right now, because the file i am trying to access is a temporary file, created via a filenamevariable that i pass to the file creation and the subprocess command. That file is being written to /tmp, where the rights are 777, so it can't be a rights issue. And the error message is not "file does not exist", but "missing filename", which suggests i am not passing a filename as parameter to the commandlinetool.

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• Python Django sites on Apache+mod_wsgi with nginx proxy: highly fluctuating performance

  - by Halfgaar

  I have an Ubuntu 10.04 box running several dozen Python Django sites using mod_wsgi (embedded mode; the faster mode, if properly configured). Performance highly fluctuates. Sometimes fast, sometimes several seconds delay. The smokeping graphs are al over the place. Recently, I also added an nginx proxy for the static content, in the hopes it would cure the highly fluctuating performance. But, even though it reduced the number of requests Apache has to process significantly, it didn't help with the main problem. When clicking around on websites while running htop, it can be seen that sometimes requests are almost instant, whereas sometimes it causes Apache to consume 100% CPU for a few seconds. I really don't understand where this fluctuation comes from. I have configured the mpm_worker for Apache like this: StartServers 1 MinSpareThreads 50 MaxSpareThreads 50 ThreadLimit 64 ThreadsPerChild 50 MaxClients 50 ServerLimit 1 MaxRequestsPerChild 0 MaxMemFree 2048 1 server with 50 threads, max 50 clients. Munin and apache2ctl -t both show a consistent presence of workers; they are not destroyed and created all the time. Yet, it behaves as such. This tells me that once a sub interpreter is created, it should remain in memory, yet it seems sites have to reload all the time. I also have a nginx+gunicorn box, which performs quite well. I would really like to know why Apache is so random. This is a virtual host config: <VirtualHost *:81> ServerAdmin [email protected] ServerName example.com DocumentRoot /srv/http/site/bla Alias /static/ /srv/http/site/static Alias /media/ /srv/http/site/media WSGIScriptAlias / /srv/http/site/passenger_wsgi.py <Directory /> AllowOverride None </Directory> <Directory /srv/http/site> Options -Indexes FollowSymLinks MultiViews AllowOverride None Order allow,deny allow from all </Directory> Ubuntu 10.04 Apache 2.2.14 mod_wsgi 2.8 nginx 0.7.65 Edit: I've put some code in the settings.py file of a site that writes the date to a tmp file whenever it's loaded. I can now see that the site is not randomly reloaded all the time, so Apache must be keeping it in memory. So, that's good, except it doesn't bring me closer to an answer... Edit: I just found an error that might also be related to this: File "/usr/lib/python2.6/subprocess.py", line 633, in __init__ errread, errwrite) File "/usr/lib/python2.6/subprocess.py", line 1049, in _execute_child self.pid = os.fork() OSError: [Errno 12] Cannot allocate memory The server has 600 of 2000 MB free, which should be plenty. Is there a limit that is set on Apache or WSGI somewhere?

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